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Merge tag 'powerpc-5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "One fix for a boot failure on 32-bit, introduced during the merge
  window.

  A fix for our handling of CLOCK_MONOTONIC in the 64-bit VDSO. Changing
  the wall clock across the Y2038 boundary could cause CLOCK_MONOTONIC
  to jump forward and backward.

  Our spectre_v2 reporting was a bit confusing due to a bug I
  introduced. On some systems it was reporting that the count cache was
  disabled and also that we were flushing the count cache on context
  switch. Only the former is true, and given that the count cache is
  disabled it doesn't make any sense to flush it. No one reported it, so
  presumably the presence of any mitigation is all people check for.

  Finally a small build fix for zsmalloc on 32-bit.

  Thanks to: Ben Hutchings, Christophe Leroy, Diana Craciun, Guenter
  Roeck, Michael Neuling"

* tag 'powerpc-5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/security: Fix spectre_v2 reporting
  powerpc/mm: Only define MAX_PHYSMEM_BITS in SPARSEMEM configurations
  powerpc/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32
  powerpc/vdso64: Fix CLOCK_MONOTONIC inconsistencies across Y2038

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